$ git clone -n https://src.fedoraproject.org/rpms/rust-ansi-str.git /var/lib/mock/f45-build-40050-767/root/chroot_tmpdir/scmroot/rust-ansi-str
Cloning into '/var/lib/mock/f45-build-40050-767/root/chroot_tmpdir/scmroot/rust-ansi-str'...
$ git fetch origin f325ad0c376482cda97509864b59ca46715b0795:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ansi-str
 * [new ref]         f325ad0c376482cda97509864b59ca46715b0795 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f325ad0 Regenerate with rust2rpm v28